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Supplementary Information Foreign Currency Exchange Gain (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Foreign Currency Exchange Gain (Loss) [Line Items] |  |  |  |  |
Exchange losses - net | $ (32) | $ (1) | $ (59) | $ (116) | [1]
Foreign Currency Transaction Gain (Loss) Tax (Expense) Benefit | 18 | (44) | 12 | 26 |
Foreign Currency Transaction Gain (Loss) After Tax | (14) | (45) | (47) | (90) |
Subsidiary Monetary Position |  |  |  |  |
Foreign Currency Exchange Gain (Loss) [Line Items] |  |  |  |  |
Exchange losses - net | 17 | (178) | 7 | (112) |
Foreign Currency Transaction Gain (Loss) Tax (Expense) Benefit | 7 | (3) | (3) | 25 |
Foreign Currency Transaction Gain (Loss) After Tax | 24 | (181) | 4 | (87) |
Hedging Program [Member] |  |  |  |  |
Foreign Currency Exchange Gain (Loss) [Line Items] |  |  |  |  |
Exchange losses - net | (49) | 177 | (66) | (4) | [2]
Foreign Currency Transaction Gain (Loss) Tax (Expense) Benefit | 11 | (41) | 15 | 1 |
Foreign Currency Transaction Gain (Loss) After Tax | $ (38) | $ 136 | $ (51) | $ (3) |
[1] | Includes a $(50) million foreign exchange loss for the six months ended June 30, 2018 related to adjustments to foreign currency exchange contracts as a result of U.S. tax reform, which is included within significant items.
[2] | Includes a $(50) million foreign exchange loss for the six months ended June 30, 2018 related to adjustments to foreign currency exchange contracts as a result of U.S. tax reform.

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